headblock means in a sawmill carriage, a cross-block on which the head of the log rests. Lexicurio rates it Sui generis — a strength score of 92 out of 100.
Etymology
From head + block.
noun
- In a sawmill carriage, a cross-block on which the head of the log rests.
- A piece of wood in a carriage (vehicle), connected with the spring and the perches, and joining the fore-gear and the hind-gear.